Locomotive cylinder cock



July 24, 1928.

WITNESS:'

S. D. WORK LOCOMOTIVE CYLINDER COCK Filed Nov. 18, 1926 Sa muez I Vbr-lr ATTORN 5v 2 Sheets-Sheet 1 INVENTOF July 24, 1928.

S. D. WORK LocoMbTIv CYLINDER cocx 2 sheets-sheet Filed NOV. 18, 1,926

f. v M m 80 k M w w v a a m a S INVENTOR ATTORNEY WITNESS:

Patented July 24, 1928. p

} UNITED STATES PATENT OFFICE.

SAMUEL ID..WORK, OF MINERVA, OHIO.

LOGOMOTIVE CYLINDER COCK.

Application filed November 18, 1926. Serial No. 149,259.

This invention relates to locomotive parts, Figure 3 is a view similar to Figure 1 particularly to cylinder cocks, and has for wlth the parts in a diiierent position.

its object the provision of a novel and im- Figure 4 is a cross sect-ion on the 1ine4l4t proved cock so constructed and arranged as of Figure 2, and

to do away with breaking of the valve as Figure 5 is a detail View. 55 occurs with the use of the ordinary type, Referring more particularly to the draw the'construction being further such as to ings, the body of thedevice is designated, entirely eliminate the cock rods, cylinder generally, by the numeral 1 and includes an and other material used in present day upper portion 2 and a lower portion proequipment. vided at one side with a lateral extension a. 60

Anotherobject of the invention is to pro- A threaded head 5 closes the member 3, this vide a cylinder cock which may be mounted head having a protuberance or projection 6 closer to the body of the steam. cylinder, of angular shape thereon engageable by a thereby greatly reducing the danger of its wrench or the like whereby it may be being knocked ofi. screwed into or out of place. Vithin the (st) It is known that the ordinary types of member 2 is astop 7. The intermediate porvalve and cook possess many disadvantages, tion of the member 3 is constricted as indione of which is that when a valve of the cated at 8 and formed with a bore 9 adapted present type in common use breaks it beto communicate with the. atmosphere 2 comes cocked in the body oi the device through ports 10. At the lower portion of and dirt will be blown on the guides and the bore 9 the constricted portion 8 is pistons, destroying lubrication'and cutting formed with relatively small passages 11 the guide and piston packing. It is with which likewise communicate with the atthesefacts in View that I have designed the mosphere. At the upper portion of the present invention which has the objects bore 9'is a valve seat 12, and located within above specified and-which has the additlonal the bore 1s a slidable valve 13 adapted to advantage that once it is opened it cannot coact with and close the seat 12, this valve be'closed except by air pressure, thus elimihaving a stem portion 14 projecting down nating danger of movement of the locomothrough the neck portion 8 of the lower tive while in a round-house, such movement body member At the upper end of the so ordinarily resulting from cylinder cocks be neck portion 8 is an enlargement 15 to which coming accidentally closed. the upper body member or section 2 is se- An additional object is to provide an ap cured as by threading. The lower portion paratus of this character which will not only of the lower member is somewhat enlarged possess the above advantages but which, and s of hollow formation and located 85 moreover, will be simple and inexpensive to therein is a piston 16 carried by a rod or manufacture andinstall, positive in action, stem 17 which projects within a tubular eflicient and durable in service, and will be a guide 18 and which. is provided with suitgeneral improvement in the art. able packing rings 19 to prevent leakage at -VVith the above and other objects and ad this point. The provision of the piston 16 on vantages in view, the invention consists in defines chambers 20 and 21, the former being the details of construction and the arrangebelow andthe latter above the piston. The ment and combination of parts to be herein tubular guide 18 forms a stop for limiting aftermore fully described and claimed, and upward movement of the piston 16 as will illustrated in the accompanying drawings, be readily. apparent. 95

in which The lateral extension 4 is recessed as-in- Figure l is a longitudinal section through dicated, the outer end of the recess being the device showing the parts in one position. closed by a removable head 22 having a pro- Figure 2 is a cross section taken onthe jection 23 thereon of angular shape adapted line 22 of Figure 1. Q to be engaged by a wrench or the like where- 14m by the head may be screwed into or out of posit-ion, as the case may be. Located within the recess in the lateral extension a are differential pistons 24: and 25 carried by a piston rod 26, these differential pistons defining chambers 27 and 28. Formed in the wall of the extension l is a passage 29 which leads into the chamber 21, and communication through this passage is controlled by means of a slide valve 30 carried by the differential piston 24:. It should be mentioned, in passing, that the piston rod 26 is of such length that when the differential pistons are at the inward limit of their movement, this piston rod will extend into the chamber 20 and engage beneath the piston 16 therein for the purpose of preventing downward movement thereof. The purpose for this will be hereinafter made apparent.

Communicating with the chamber 28 is a passage 31 formed in the wall of the extension l and extending throu h the outer end thereof, and likewise forme in the wall of the extension is a passage 82 which communicates with the chamber 27 and with a groove 83, the end of this passage where it enters the chamber 20 being covered or uncovered, as the case may be, by means of a slide valve 34 carried by the piston 16. The wall of the extension 4: is also provided with a relatively small passage 35 which extends from the end thereof in the chamber 20.

lVhen the device is properly connected up with a locomotive, the operation is as follows: Air from the main reservoir passes the threeway valveordinarily provided in the cab of the locomotive and enters the cylinder cock at the connection provided at the passage 35 and is free to flow into the chamber 20, forcing the air piston 16 upwardly so that the stem 17 thereof will engage against the stem portion 14: of the cylinder cook 13 and lift it from its seat. Steam is free to pass from the cylinder to the atmosphere through the valve seat 12, here 9 and ports 10. Air from the chamber 20 then passes through the passage 32, uncovered by the upward movement of the slide valve 3 1, and enters the chamber 27, moving the differential pistons 24 and 25 and the stem 26 carrying the same inwardly. When this occurs the stem 26 projects into the chamber 21 beneath the piston 16, thereby holding the cylinder cock or valve 13 off its seat. In order to close the cylinder cock or valve 13, air is admitted through the connection or the passage 31, the air passing into the chamber 28 and forcing the differential piston to the left, carrying therewith the slide valve 30 and piston rod 26 so thatair is free to pass from the chamber 28 through the passage 29 into the chamber 21, thereby forcing the air piston 16 downwardly so that the cylinder cook or valve 13 may return to its normal position, by gravity or by steam pressure acting on the valve. The air within the chambers 20 and 21 is released therefrom through the same passages and pipe as it enters by the three-way valve provided in the cab of the locomotive.

From the foregoing description and a study of the drawings, it will be readily apparent that I have provided a greatly improved cylinder cock or valve which, after being opened, cannot possibly return to closed position until positive air pressure is supplied for the purpose. Obviously, this will prevent accidental opening of the valve with the resultant disastrous consequences which might occur. Clearly, the number of parts is greatly reduced and the construction thereby simplified and made much cheaper, the device being therefore easy to manufacture and install. The construction is such that the device may be mounted close to the steam cylinders, thereby greatlyreducing likelihood of being knocked off as might occur under some circumstances. It is really believed that the construction, operation and advantages will be readily apparent to one skilled in the art without further explanation.

While I have shown and described the preferred embodiment of the invention, it should be understood that I reserve the right to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claim.

Having thus described the invention, I claim rr In a locomotive cylinder cock device, a body member formed at one end with a steam inlet and provided at its other end with a chamber, the intermediate portion of the body having a bore therein terminating in a valve seat communicating with the steam inlet portion, the intermediate portion further having steam outlet ports, a longitudinally movable valve within said bore cooperating with said seat, a piston within said chamber having a stem engageable with said valve for unseating the same when the piston moves in one direction, a stop projectable into said chamber to hold said piston against reverse movement, and air pressure operated means for moving said stop, comprising differential pistons slidably mounted at one side of said chamber portion of the body, and mounted upon a piston rod constituting said stop, and air pressure means cooperating with said differential pistons for moving the same and the stop on which they are mounted, said last means comprising a passage communicating with the space defined between the dif-' ferential pistons andwith said chamberat one side of the piston therein, a compressed air inlet through the chamber at the other side of the piston, a compressed air inlet into the space between the differential pistons, a slide valve carried by one difierential piston for controlling the flovv of air through said first named passage, a passage communicating With the space at the outer end of the chamber Within which the differjential pistons operate and communicating with the first named chamber, and a slide valve carried by said first named piston for controlling communication through said last named passage.

In testimony whereof I afiix my signature.

- SAMUEL D. WORK. 

